Date
1 - 11 of 11
How to disassemble Tek 2236 ? ... for A1 mainboard HV section
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chipbee40
Whistle noise on these is almost always from T906 or T944.
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I've never tried resoaking them in transformer varnish but it may work if you don't have access to replacements. JC --- In TekScopes@..., "cc_electronic" <ciro.carbone@...> wrote:
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Glenn Little
Sounds like the capacitor is venting.
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Replace the capacitor. 73 Glenn WB4UIV At 11:24 PM 8/31/2010, you wrote:
When a capacitor whistles loudly, what is that an indicator of? And, how is it resolved? |
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J. L. Trantham
Pickle?
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Frank P
When a capacitor whistles loudly, what is that an indicator of? And, how is it resolved?
Thanks.
Frank P. |
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sbirdasn <sbirdasn@...>
--- In TekScopes@..., "cc_electronic" <ciro.carbone@...> wrote:
Nicely done! The 2236/A is my favorite 2200 series scope! I love the CTM on that scope. Best thing is that unlike many other CTM optioned scopes, the CTM goes easily to full rated bandwidth. If you can trigger it, you can count it. Oh, and the 5000 count DMM side is great too. Love being able to trace down artwork shorts with 1/100 ohm resolution metering. And that was in the day when >3.5 digit DMM's were both expensive and hard to find in the wild unless you worked in a very good engineering lab. Your efforts will yield great returns on the test bench. Sbirdasn. |
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cc_electronic
You're right!
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R889 was open... replaced it and the focus is now good. before (R889 open) --> http://picasaweb.google.com/116568688030447199475/DropBox?authkey=Gv1sRgCPzsm4302ZXSEw#5510425901585135602 after (R889 replaced)--> http://picasaweb.google.com/116568688030447199475/DropBox?authkey=Gv1sRgCPzsm4302ZXSEw#5511299525766373474 Remained only one capacitor that whistles loudly. I tried with my ear to understand where it comes from and I think C906 Thanks again to all! --- In TekScopes@..., "Kevin Wood" <mailinglists@...> wrote:
Do you have any suggestions for me to fix the problem? ...or someMine exhibited a similar problem once and the culprit was a group of 4 |
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cc_electronic
Thank you Kevin. I check the series of 4 510Kohm resistors.
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I will inform you --- In TekScopes@..., "Kevin Wood" <mailinglists@...> wrote:
Do you have any suggestions for me to fix the problem? ...or someMine exhibited a similar problem once and the culprit was a group of 4 |
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Kevin Wood G7BCS
Do you have any suggestions for me to fix the problem? ...or someMine exhibited a similar problem once and the culprit was a group of 4 series connected 510k resistors in the dropper chain that fed the focus control. These run a little hot and one had failed. Kevin |
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cc_electronic
Thank you very much! ...Section 6 of the Service Manual :-)
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Thanks to David and Tom (by e-mail) I disassembled the CTM and power-supply shield circuit and now I have access to the focus circuit. Do you have any suggestions for me to fix the problem? ...or some experience... or some particular topics on this board or related link to webpage/blog ?... I noticed that when the instrument is power-on there are also "whistler" capacitors in these circuit parts (how can I identify whistling capacitors to replace?) --- In TekScopes@..., "cc_electronic" <ciro.carbone@...> wrote:
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get the service manual - the maintenance section gives you all you should need to know to dis-assemble it.
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Regards, David Partridge -----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf Of cc_electronic Sent: 28 August 2010 13:20 To: TekScopes@... Subject: [TekScopes] How to disassemble Tek 2236 ? ... for A1 mainboard HV section Hello. I have an old Tektronix 2236 with a focus problems. Here, at link below, as you can see, the focus potentiometer is fully counterclockwise and the trace is blur: http://picasaweb.google.com/116568688030447199475/DropBox?authkey=Gv1sRgCPzsm4302ZXSEw#5510425901585135602 Can you give me any aid? And how to disassemble the circuit parts to have access in focus-circuit (R892, C893, Q885, etc.) in A1 main board ??? Thanks everyone! ------------------------------------ Yahoo! Groups Links |
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cc_electronic
Hello.
I have an old Tektronix 2236 with a focus problems. Here, at link below, as you can see, the focus potentiometer is fully counterclockwise and the trace is blur: http://picasaweb.google.com/116568688030447199475/DropBox?authkey=Gv1sRgCPzsm4302ZXSEw#5510425901585135602 Can you give me any aid? And how to disassemble the circuit parts to have access in focus-circuit (R892, C893, Q885, etc.) in A1 main board ??? Thanks everyone! |
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